R. Wedemeyer
University of Bonn
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Featured researches published by R. Wedemeyer.
Physics Letters B | 1979
R. Brandelik; W. Braunschweig; K. Gather; V. Kadansky; K. Lübelsmeyer; P. Mättig; H.-U. Martyn; G. Peise; J. Rimkus; H.G. Sander; D. Schmitz; A. Schultz von Dratzig; D. Trines; W. Wallraff; H. Boerner; H. M. Fischer; H. Hartmann; E. Hilger; W. Hillen; G. Knop; W. Korbach; P. Leu; B. Löhr; F. Roth; W. Rühmer; R. Wedemeyer; N. Wermes; M. Wollstadt; R. Buhring; R. Fohrmann
Abstract Hadron jets produced in e+e− annihilation between 13 GeV and 31.6 GeV in c.m. at PETRA are analyzed. The transverse momentum of the jets is found to increase strongly with c.m. energy. The broadening of the jets is not uniform in azimuthal angle around the quark direction but tends to yield planar events with large and growing transverse momenta in the plane and smaller transverse momenta normal to the plane. The simple q q collinear jet picture is ruled out. The observation of planar events shows that there are three basic particles in the final state. Indeed, several events with three well-separated jets of hadrons are observed at the highest energies. This occurs naturally when the outgoing quark radiates a hard noncollinear gluon, i.e., e + e − → q q g with the quarks and the gluons fragmenting into hadrons with limited transverse momenta.
Physics Letters B | 1992
M. Derrick; D. Krakauer; S. Magill; B. Musgrave; J. Repond; K. Sugano; R. W. Stanek; R. L. Talaga; J. L. Thron; F. Arzarello; R. Ayed; G. Barbagli; G. Bari; M. Basile; L. Bellagamba; D. Boscherini; G. Bruni; P. Bruni; Gc Romeo; G. Castellini; M. Chiarini; L. Cifarelli; F. Cindolo; F. Ciralli; A. Contin; S. D'Auria; C. Del Papa; F. Frasconi; P. Giusti; G. Iacobucci
Abstract The total photoproduction cross section is determined from a measurement of electroproduction with the ZEUS detector at HERA. The Q 2 values of the virtual photons are in the range 10 −7 Q 2 −2 GeV 2 . The γp total cross section in the γp centre of mass energy range 186–233 GeV is 154 ± 16 (stat.) ± 32 (syst.) μ b.
Physics Letters B | 1998
M.Q. Tran; J. Barth; C. Bennhold; M. Bockhorst; W. Braun; A. Budzanowski; G. Burbach; R. Burgwinkel; J. Ernst; K.-H. Glander; S. Goers; B. Guse; K.-M. Haas; J. Hannappel; K. Heinloth; K. Honscheid; T. Jahnen; N. Jöpen; H. Jüngst; H. Kalinowsky; U. Kirch; F. Klein; Friedrich Klein; E. Klempt; D. Kostrewa; A. Kozela; R. Lawall; L. Lindemann; J. Link; J. Manns
Abstract Associated strangeness production in the reactions γp → K + Λ and γp → K + Σ 0 was measured with the SAPHIR detector at the electron stretcher ring ELSA at Bonn. Data on total and differential cross sections and on hyperon polarizations are presented. The total cross section for Λ production shows a strong threshold enhancement whereas the Σ 0 data have a maximum at about E γ =1.45 GeV. Along with the angular decomposition of the differential cross section into polynomials, this suggests resonance production. However, the angular distributions of both hyperon polarizations vary only slightly with the photon energy. Λ and Σ 0 polarizations show opposite signs and change sign over the angular range.
European Physical Journal A | 1990
W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; A. J. Martin; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Genser; H. Hultschig; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig; D. Notz; J. M. Pawlak; K. U. Pösnecker; E. Ros; D. Trines; R. Walczak; G. Wolf
AbstractJet properties ine+e− annihilation at center of mass energies of 14, 22, 35 and 43.7 GeV were studied with the data collected in the TASSO detector at PETRA, using the same evaluation procedures for all the energies. The total hadronic cross section ratio for the center of mass energy interval 39–47 GeV was determined to be ℛ=4.11±0.05 (stat)±0.18(syst.) at
Physics Letters B | 1979
R. Brandelik; J. C. Hart; J. Proudfoot; D. Heyland; H.G. Sander; E. Hilger; R. Fohrmann; Jorg Pyrlik; D. H. Saxon; W. Braunschweig; H. Hultschig; A. Ladage; P.J. Dornan; S. L. Lloyd; H.-U. Martyn; D. Revel; G. Mikenberg; H. M. Fischer; Roger J Cashmore; O. Römer; H. Boerner; D. Trines; M. Wollstadt; B. Löhr; Kenneth Watson Bell; G. Poelz; M. Ogg; Roger Barlow; D. A. Garbutt; R. Wedemeyer
Physics Letters B | 1980
R. Brandelik; A. Pevsner; J. Proudfoot; D. G. Cassel; D. Heyland; H.G. Sander; S. Yarker; E. Hilger; D. R. Quarrie; R. Fohrmann; Jorg Pyrlik; D. H. Saxon; W. Braunschweig; H. Hultschig; A. Ladage; P.J. Dornan; Peter Mattig; H.-U. Martyn; J.K. Sedgbeer; D. Revel; G. Mikenberg; H. M. Fischer; W. Chinowsky; O. Römer; H. Boerner; D. Trines; M. Wollstadt; B. Löhr; Kenneth Watson Bell; G. Poelz
\langle \sqrt s \rangle = 43 - 7
Physics Letters B | 1989
W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; A.J. Martin; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Genser; H. Hultschig; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; D. Notz; J. M. Pawlak; K. U. Pösnecker; E. Ros; D. Trines; R. Walczak; G. Wolf; H. Kolanoski
European Physical Journal C | 1989
W. Braunschweig; R. Gerhards; F. J. Kirschfink; H.-U. Martyn; H. M. Fischer; H. Hartmann; J. Hartmann; E. Hilger; A. Jocksch; R. Wedemeyer; B. Foster; A. J. Martin; E. Bernardi; J. J. Chwastowski; A. Eskreys; K. Gather; K. Genser; H. Hultschig; P. Joos; H. Kowalski; A. Ladage; B. Löhr; D. Lüke; P. Mättig; D. Notz; J. M. Pawlak; K. U. Pösnecker; E. Ros; D. Trines; R. Walczak
GeV. Corrected distributions of global shape variables are presented as well as the inclusive charged particle distributions for scaled momentum and transverse momentum. The center of mass energy evolution of the average sphericity, thrust, aplanarity and particle momentum is shown.
Physics Letters B | 1980
R. Brandelik; W. Braunschweig; K. Gather; Kadansky; K. Lübelsmeyer; P. Mättig; H.-U. Martyn; G. Peise; J. Rimkus; H.G. Sander; D. Schmitz; A. Schultz von Dratzig; D. Trines; W. Wallraff; H. Boerner; H. M. Fischer; H. Hartmann; E. Hilger; W. Hillen; L. Koepke; G. Knop; P. Leu; B. Löhr; R. Wedemeyer; N. Wermes; M. Wollstadt; H. Burkhardt; D. G. Cassel; D. Heyland; H. Hultschig
Abstract We have observed e + e − hadrons at C.M. energies of 13 GeV and 17 GeV at PETRA using the TASSO detector. We find R (13 GeV) = 5.6 ± 0.7 and R (17 GeV) = 4.0 ± 0.7. The additional systematic uncertainty is 20%. Comparing inclusive charged hadron spectra we observe scaling between 5 GeV and 17 GeV for x = p / p beam > 0.2; however the 13 GeV cross section is above the 17 GeV cross section for smaller x . This may be due to copious bb production. The events become increasingly jet like at high energies as evidenced by a shrinking sphericity distribution with increasing energy.
Physics Letters B | 1980
R. Brandelik; W. Braunschweig; K. Gather; V. Kadansky; F. J. Kirschfink; K. Lübelsmeyer; H.-U. Martyn; G. Peise; J. Rimkus; H. G. Sander; D. Schmitz; A. Schultz von Dratzig; D. Trines; W. Wallraff; H. Boerner; H. M. Fischer; H. Hartmann; E. Hilger; W. Hillen; G. Knop; L. Koepke; H. Kolanoski; P. Leu; B. Löhr; R. Wedemeyer; N. Wermes; M. Wollstadt; H. Burkhardt; D. G. Cassel; D. Heyland
Abstract Hadron production by e + e − annihilation has been studied for c.m. energies W between 13 and 31.6 GeV. As a function of 1n W the charged particle multiplicity grows faster at high energy than at lower energies. This is correlated with a rise in the plateau of the rapidity distribution. The cross section s d σ /d x is found to scale within ±30% for x > 0.2 and 5 ⩽ W ⩽ 31.6 GeV.
